Work Notes: MySiddur This is a useful tool: https://www.myzmanim.com/ Dissecting the results to know the best times for Shacharis. Results from myzmanim.com: " Okay, let's dissect these zmanim (Jewish times) for Sunday, August 3, 2025, in Illinois to determine the Shacharit prayer window you asked about, particularly the latest times it's still kosher. First, it's important to understand the different opinions presented, especially for "Latest Shema" and "Latest Shacharis." "Magen Avraham" is generally a stricter (earlier) opinion for these cut-off times, often based on a calculation of 72 minutes before sunrise for dawn and a specific approach to halachic hours. "Gra & Baal HaTanya" (referring to the Vilna Gaon and Rabbi Schneur Zalman of Liadi) represent a more lenient (later) opinion for these cut-off times, often based on the actual visible sunrise and a different calculation of halachic hours. Here's how we dis...